How much energy is needed to melt a 4 kg piece of iron taken at the melting temperature?
| May 18, 2021 | education
How much energy is needed to melt a 4 kg piece of iron taken at the melting temperature? The specific heat of fusion of iron is 27 kJ / kg.
m = 4 kg.
λ = 27 kJ / kg = 27000 J / kg.
Q -?
The amount of heat Q, which is necessary to transfer a substance from a solid to a liquid state, at the melting temperature is expressed by the formula: Q = λ * m, where λ is the specific heat of fusion, m is the mass of the substance.
Q = 27000 J / kg * 4 kg = 108000 J.
Answer: to melt a piece of iron weighing 4 kg, Q = 108000 J.
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